What is the difference between the spray gun vs. spray can pre-marking systems?

For the pre-marking system with a paint gun, there is a small tank to put the paint in and the application is done with a paint gun (as used for marking paint).

The pre-marking with a gun is more cost-effective to use and has a reach of approximately 2000 meters per refill.

For the pre-marking system using a paint can, pre-marking is done with an aerosol (for which you need to purchase aerosols). A can of aerosol reaches approximately 1000-1200 meters.